/*     CalculiX - A 3-dimensional finite element program                 */
/*              Copyright (C) 1998-2018 Guido Dhondt                          */

/*     This program is free software; you can redistribute it and/or     */
/*     modify it under the terms of the GNU General Public License as    */
/*     published by the Free Software Foundation(version 2);    */
/*                    */

/*     This program is distributed in the hope that it will be useful,   */
/*     but WITHOUT ANY WARRANTY; without even the implied warranty of    */ 
/*     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the      */
/*     GNU General Public License for more details.                      */

/*     You should have received a copy of the GNU General Public License */
/*     along with this program; if not, write to the Free Software       */
/*     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.         */

#include <unistd.h>
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <pthread.h>
#include "CalculiX.h"

static ITG *nface1,*ielfa1,*ipnei1,*nef1,*num_cpus1,*neij1;

static double *vel1,*flux1,*vfa1,*xxi1,*xle1,*gradtel1;

void hrt_udmain(ITG *nface,ITG *ielfa,double *vel,ITG *ipnei,ITG *nef,
		double *flux,double *vfa,ITG *num_cpus,double *xxi,
                double *xle,double *gradtel,ITG *neij){

    ITG i;
      
    /* variables for multithreading procedure */
    
    ITG *ithread=NULL;;
    
    pthread_t tid[*num_cpus];

    /* calculation of the density at the cell centers */
    
    ielfa1=ielfa;vel1=vel;ipnei1=ipnei;nef1=nef;flux1=flux;vfa1=vfa;
    num_cpus1=num_cpus;nface1=nface;xxi1=xxi;xle1=xle;gradtel1=gradtel;
    neij1=neij;
    
    /* create threads and wait */
    
    NNEW(ithread,ITG,*num_cpus);
    for(i=0; i<*num_cpus; i++)  {
	ithread[i]=i;
	pthread_create(&tid[i], NULL, (void *)hrt_ud1mt, (void *)&ithread[i]);
    }
    for(i=0; i<*num_cpus; i++)  pthread_join(tid[i], NULL);
    
    SFREE(ithread);
  
  return;

}

/* subroutine for multithreading of calcgammav1 */

void *hrt_ud1mt(ITG *i){

    ITG nfacea,nfaceb,nfacedelta;

    nfacedelta=(ITG)floor(*nface1/(double)(*num_cpus1));
    nfacea=*i*nfacedelta+1;
    nfaceb=(*i+1)*nfacedelta;
    if((*i==*num_cpus1-1)&&(nfaceb<*nface1)) nfaceb=*nface1;

    FORTRAN(hrt_ud,(ielfa1,vel1,ipnei1,nef1,flux1,vfa1,
		     &nfacea,&nfaceb,xxi1,xle1,gradtel1,neij1));

    return NULL;
}
